Method for determining organic acid stable carbon isotope in Jiang-flavor Chinese spirit

The invention discloses a method for determining an organic acid stable carbon isotope in Jiang-flavor Chinese spirit by gas chromatography-combustion-isotope ratio mass spectrometer (GC-C-IRMS), andthe method is characterized in that: the Jiang-flavor Chinese spirit is directly injected, a gas chromatograph equipped with a capillary chromatography column is used to separate an organic acid fromother components, and organic acid stable carbon isotope ratio delta13C in the Jiang-flavor Chinese spirit can be analyzed by the isotope ratio mass spectrometer. The method combines the gas chromatography separation theory and the stable isotope technology to realize the more stable and accurate determination of the organic acid stable carbon isotope composition and ratio in the Jiang-flavor Chinese spirit, and does not require pre-treatment before the determination, a Jiang-flavor Chinese spirit sample directly enters the gas chromatograph, then is separated and burnt, and is determined by the isotope ratio mass spec